I’m happy to announce the release of version 0.2 of the rsconf crate, with new support for informing Cargo about the presence of custom cfg keys and values (to work around a major change that has resulted in hundreds of warnings for many popular crates under 1.80 nightly).
rsconf itself is a newer crate that was born out of the need (in the fish-shell transition from C++ to rust) for a replacement for some work that’s traditionally been relegated to the build system (e.g. CMake or autoconf) in order to “feature detect” various native system capabilities in the kernel, selected runtime (e.g. libc), or installed libraries. It (optionally) integrates with the popular cc crate so you can test and configure the build toolchain for various underlying features or behavior, and then unlock conditional compilation of native rust code that interops with the system or external libraries accordingly.